My book on the science behind all fighting techniques and the teaching thereof is about complete. There's only an anatomical explanation of wrist twists and wrist crushes to be obtained.
The photo shoot and illustrations are in the process of being organised.
The above photograph shows a shoulder lock that can be understood and studied by reference to the applied forces and their effect on the humerus. It will also be explained that additional forces need to be applied to keep the officer from bending further forward as the body naturally moves to release the tension in the shoulder joint.
By the way, any reader who has a 'snappy' title suggestion, I'd appreciate it. The above description can follow after the ':', however, need a snappy title apparently. Unfortunately 'Fighting Science' is already taken.